JP6196409B1 - Coolant supply device - Google Patents

Abstract

A coolant supply device capable of effectively suppressing precipitation, accumulation, and the like of foreign matters in a coolant tank is provided.
A first and second coolant tanks 5 and 7 arranged in parallel at a predetermined interval, and a communication portion 8 provided between the first and second coolant tanks 5 and 7 for communicating the two are provided. A coolant tank 2 having a U-shape is formed, and pumps 30, 31, and 32 that pump the coolant in the second coolant tank 7 and supply the coolant to a predetermined portion, and are supplied by the supply pumps 30, 31, and 32. The coolant is returned to the first coolant tank 5, flows through the communication portion 8, and flows into the second coolant tank 7. The first agitating nozzle body 20 that discharges the coolant and assists the flow of the coolant toward the communication portion 8 is disposed in the first coolant tank 5. The coolant is discharged and the coolant flowing in from the communication portion 8 is discharged. A second stirring nozzle body 23 for assisting the flow is disposed in the second coolant tank 7.
[Selection] Figure 2

Description

  The present invention relates to a coolant supply device that supplies coolant to a predetermined portion, for example, a machining area of a machine tool.

  2. Description of the Related Art Conventionally, there has been proposed a coolant processing apparatus configured to supply a coolant into a machining area of a machine tool and to separate chips and the like from a coolant recirculated from the machine tool (the following Patent Document 1).

  The coolant processing apparatus includes a dirty tank that receives chips and coolant discharged from a machine tool, a filtration drum that is immersed in the coolant in the dirty tank and filters the coolant while it is taken into the interior, and a first side of the dirty tank. A first coolant tank having a path communicating with the internal space of the filtration drum through an opening formed on the first side surface of the dirty tank; and a second side surface side of the dirty tank. A second coolant tank surrounded by a side wall, a coupling path communicating with the first coolant tank and the second coolant tank, and a center in a plan view apart from the side wall of the second coolant tank, And a pump that pumps the coolant from the second coolant tank and supplies the coolant to the machine tool.

  A rear side wall surface of the coupling path extends from a rear side wall surface of the second coolant tank, and a side wall of the second coolant tank passes through the front side from the rear side to the dirty tank. The part reaching the side is a continuous surface including a concave curved surface. A coolant tank is formed from the first coolant tank, the second coolant tank, and the coupling path.

  According to this coolant processing apparatus, since the coolant in the second coolant tank is pumped up by the pump provided near the center of the second coolant tank, the coolant flow in the second coolant tank is centered on the pump pumping port. It is said that since the foreign matter in the second coolant tank is pumped up by this pump, foreign matter accumulation and stagnation in the second clean tank can be suppressed.

JP 2009-226491 A

  However, even in the conventional coolant processing apparatus devised in this way, the problem that chips, sludge, and the like are deposited and accumulated in various places in the coolant tank has not been sufficiently solved.

  That is, the above-described conventional coolant processing apparatus generates a coolant flow from the first coolant tank to the second coolant tank by the action of the pump pumping up the coolant and the action of returning the coolant from the machine tool. is there. For this reason, in the case of a pump having a pumping capacity generally required by a machine tool, apart from the case where the pump has a very high pumping capacity, the first coolant tank, the second coolant tank, and the connection path In this case, it is not possible to generate a liquid flow having a flow rate sufficient to suppress sedimentation and accumulation of chips and sludge.

  As a result, there has been a problem that chips, sludge, and the like are precipitated and deposited at various locations in the first coolant tank, the second coolant tank, and the coupling path.

  The present invention has been made in view of the above circumstances, and provides a coolant supply device capable of suppressing the precipitation and accumulation of foreign matter in the tank by generating a liquid flow at a sufficient flow rate in the coolant tank. And its purpose.

The present invention for solving the above problems
The first and second coolant tanks having a substantially rectangular shape in plan view and arranged in parallel with a predetermined interval therebetween, and one end of the first and second coolant tanks are provided at one end. Including a communication part connected to the side wall of the first coolant tank, the other end connected to the side wall of the second coolant tank, and the first coolant tank and the second coolant tank communicating with each other. A coolant tank formed in a letter shape,
A supply pump that pumps up the coolant in the second coolant tank and supplies the coolant to a predetermined site;
The coolant supplied to the predetermined portion by the supply pump is returned to the first coolant tank, and the coolant in the first coolant tank flows through the communication portion and flows into the second coolant tank. In the coolant supply device,
At least one agitation pump for pumping up the coolant in the coolant tank;
A first agitation nozzle body disposed in the first coolant tank and discharging the coolant supplied from the agitation pump to assist the flow of the coolant toward the communication part;
Coolant supply comprising a second agitation nozzle body disposed in the second coolant tank and for discharging the coolant supplied from the agitation pump and assisting the flow of the coolant flowing in from the communication portion Related to the device.

  According to this coolant supply device, the coolant in the second coolant tank is pumped up by the supply pump and supplied to a predetermined portion, for example, a processing region of the machine tool, and the supplied coolant is mixed with foreign matters such as chips and sludge. Then, the refrigerant is returned to the first coolant tank through a predetermined flow path. And the coolant recirculated to the 1st coolant tank distribute | circulates a communicating part, and flows in into a 2nd coolant tank.

  Further, the first coolant tank is provided with a first stirring nozzle body, and the coolant in the coolant tank is supplied to the first stirring nozzle body by the stirring pump, and is discharged from the first stirring nozzle body. Then, the coolant flow toward the communication portion is assisted by the coolant discharged from the first stirring nozzle body, whereby the coolant in the first coolant tank is stirred, and the flow velocity of the coolant in the communication portion is accelerated. Is done.

  Thus, the stirring action of the coolant in the first coolant tank and the accelerating action of the coolant in the communication part prevent foreign matter from being precipitated and deposited in the first coolant tank and the communication part.

  Further, the second coolant tank is provided with a second stirring nozzle body, and the coolant is also supplied from the stirring pump to the second stirring nozzle body and is discharged from the second stirring nozzle body. And the flow of the coolant flowing in from the communication part is assisted by the coolant discharged from the second stirring nozzle body, whereby the coolant in the second coolant tank is stirred, and by the stirring action of such coolant, In the second coolant tank, it is possible to prevent foreign matters from being precipitated and deposited.

  Thus, according to the coolant supply apparatus according to the present invention, the coolant in the first and second coolant tanks is stirred by the coolant discharged from the first and second stirring nozzle bodies, and the coolant in the communicating portion is also stirred. Since the flow of is accelerated, it is possible to suppress the precipitation and accumulation of foreign matters in the first and second coolant tanks and the communication portion.

  In the coolant supply device, at least one of the first stirring nozzle body and the second stirring nozzle body has a plurality of discharge ports, and among the plurality of discharge ports, at least one of the discharge ports. The discharge direction is preferably directed closer to the center in the tank than the discharge directions of the other discharge ports.

  While providing a plurality of discharge ports, the inside of the tank can be uniformly stirred by directing the discharge direction of at least one of the discharge ports toward the center of the tank rather than the discharge direction of the other discharge ports. It is possible to more effectively suppress the precipitation and accumulation of chips and sludge. That is, the vicinity of the center of the tank is a place where stagnation is relatively likely to occur, but it is possible to prevent stagnation from occurring near the center by directing the coolant discharge direction toward the center of the tank. It is possible to prevent foreign matters from being precipitated and deposited.

  If foreign matter is likely to settle and accumulate in either of the first and second coolant tanks, a plurality of discharge ports are provided on the corresponding one of the first and second stirring nozzle bodies. If both the first and second coolant tanks are likely to precipitate and deposit foreign matter, the first and second stirring nozzle bodies may be provided with a plurality of discharge ports.

  Further, in the coolant supply apparatus, the second coolant tank may include a baffle plate provided at a front position in the coolant discharge direction of the second stirring nozzle body, and the baffle plate causes the flow of the coolant to flow. It is preferable that the coolant extends from the inner wall of the second coolant tank to the inside of the tank with an interval through which the coolant can flow between the inner wall of the second coolant tank and the bottom surface.

  In the second coolant tank, a liquid flow is assisted by the coolant discharged from the discharge port of the second stirring nozzle body, and a swirl flow (vortex flow) swirling along the tank wall is formed. And the flow rate of a coolant will be in the weakest state in the position away from the 2nd stirring nozzle body, ie, a front position, and will be in the state which a foreign material tends to settle and accumulate in the same part.

  According to the coolant supply device provided with the baffle plate, the baffle plate is provided at the front position where the flow rate of the coolant is weakened. Thus, it becomes a mode of passing through a gap formed between the baffle plate and the tank bottom surface. Thus, the flow path of the coolant is thus narrowed by the baffle plate, so that the flow rate of the coolant passing through the gap is increased, thereby preventing foreign matter from being precipitated and deposited in the same portion. The

  In the coolant supply apparatus, the second coolant tank extends from the communication portion along the inner wall surface of the tank so as to face the inner wall surface of the tank, and regulates the flow of the coolant flowing in from the communication portion. It is preferable to provide a current plate.

  As described above, in the second coolant tank, the liquid flow is assisted by the coolant discharged from the discharge port of the second stirring nozzle body, and a swirl flow swirling along the tank wall is formed. Therefore, in the connection part of the said communication part and a 2nd coolant tank, the coolant flow which flows in from a communication part and the turning coolant flow in a 2nd coolant tank collide, and the inflow of the coolant from a communication part is inhibited. In the communication part, foreign matters are likely to precipitate and accumulate.

  By providing the rectifying plate described above, the coolant flow flowing from the communication portion and the swirling coolant flow in the second coolant bath can be smoothly joined at the connection portion between the communication portion and the second coolant tank, It is possible to improve the inflow of coolant from the communication portion. Thereby, it can prevent that a foreign material settles and accumulates in a communicating part.

  As described above, according to the coolant supply apparatus of the present invention, the coolant in the first and second coolant tanks is stirred by the coolant discharged from the first and second stirring nozzle bodies, and the communication portion Since the coolant flow is accelerated, it is possible to suppress the precipitation and accumulation of foreign matters in the first and second coolant tanks and the communication portion.

It is the perspective view which showed the coolant supply apparatus which concerns on one Embodiment of this invention. It is the top view which showed the coolant supply apparatus which concerns on this embodiment. It is sectional drawing of the arrow AA direction in FIG.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. The coolant supply device 1 of this example is a device that is attached to a machine tool (not shown) and supplies a coolant C to a processing region or the like. As shown in FIGS. 1 and 2, the overall shape is substantially U-shaped in plan view. And a coolant tank 2 in which the coolant C is stored.

  Specifically, the coolant tank 2 has a rectangular shape in plan view, and the first coolant tank 3 and the second coolant tank 7 arranged in parallel with each other at a predetermined interval, and the first coolant tank 3. 2 and the second coolant tank 7 (the lower end in FIG. 2), one end is connected to the side wall of the first coolant tank 3, and the other end is the second coolant tank 7. The communication part 8 connected to a side wall and making the 1st coolant tank 3 and the 2nd coolant tank 7 communicate is included. The first coolant tank 3 is partitioned into two tanks by a partition plate 6 in a liquid-tight manner, and the upper tank in the figure is the advanced clean tank 4 and the lower tank in the figure is the reflux tank 5. .

  As shown in FIG. 2, a current plate 9 is disposed at the lower right corner of the reflux tank 5, and the current plates 10, 11, 12 are also provided at each corner of the second coolant tank 7. Is arranged. These rectifying plates 9, 10, 11, and 12 are bent so as to form multiple faces, and are thereby formed into a substantially arc shape.

  The advanced clean tank 4 is provided with a first pump 27, the reflux tank 5 is provided with a second pump 28 and a third pump 29 in the vicinity of the side wall on the second coolant tank 7 side, A first stirring nozzle body 20 is disposed at a position that forms a diagonal with the connection portion of the communication portion 8. Further, the second coolant tank 7 is provided with a second stirring nozzle body 23 at a position facing the connection portion of the communication part 8, and the fourth pump 30 and the fifth A pump 31 and a sixth pump 32 are disposed, and a third stirring nozzle body 26 is disposed in the communication portion 8. The first stirring nozzle body 20, the second stirring nozzle body 23, and the third stirring nozzle body 26 are in a state of being immersed in the coolant C.

  The first pump 27 is a pump that pumps up the coolant C in the advanced clean tank 4 and supplies it to a circulation path formed in the main shaft of the machine tool, and the second pump 28 is provided in the reflux tank 5. The coolant C is pumped up and supplied to the first stirring nozzle body 20, the second stirring nozzle body 23, and the third stirring nozzle body 26. The third pump 29 pumps up the coolant C in the reflux tank 5 and This pump is supplied above the machining area of the machine tool and discharged into the machining area.

  The fourth pump 30, the fifth pump 31, and the sixth pump 32 are pumps for pumping up the coolant C of the second coolant tank 7, respectively. The pump 30 pumps the pumped coolant C, and the fourth pump 30 is not shown. The fifth pump 31 is supplied to the vicinity of the spindle of the machine tool and discharged into the machining area, and the sixth pump 32 is supplied to the base portion of the machine tool. The first pump 27 is attached to a mounting plate (not shown) constituting the top plate of the advanced clean tank 4, and the second pump 28, the third pump 29, the fourth pump 30, the fifth pump 31 and the sixth pump. The pumps 32 are each attached to a top plate (not shown) that closes the coolant tank 2.

  Further, in the space between the first coolant tank 3 and the second coolant tank 7 of the coolant tank 2, a chip conveyor (not shown) as disclosed in Patent Document 1 described above is disposed, The coolant C supplied to the machining area of the machine tool is collected on the chip conveyor in a state including chips and sludge.

  Further, the chip conveyor includes a drum-shaped filter (drum filter) (not shown) disclosed in Patent Document 1 described above, and the coolant C is filtered when entering the inside of the drum filter. Then, chips and sludge having a predetermined size are separated from the coolant C and removed. The internal space of the drum filter communicates in a liquid-tight manner through an opening (not shown) formed in the side wall of the reflux tank 5 on the second coolant tank 7 side. Thus, the coolant C supplied to the machining area of the machine tool is collected on the chip conveyor, filtered by the drum filter, and then returned to the reflux tank 5.

  Note that the coolant C supplied from the first pump 27 to the circulation path of the spindle and the coolant C supplied from the sixth pump 32 to the base portion of the machine tool are separately supplied to the reflux tank 5 through flow paths formed separately. To reflux. Further, the coolant C pumped up by the sixth pump 32 is also used for so-called reverse cleaning for eliminating clogging of the drum filter. Further, as described above, the coolant C pumped up by the fourth pump 30 is supplied to a filter device (not shown), highly purified by this filter device, and then supplied to the advanced clean tank 4 and supplied. When the amount of coolant is excessive, it overflows from the opening 6a formed in the partition plate 6 to the reflux tank 5.

  The first stirring nozzle body 20 includes two parallel nozzles 21 and 22 that discharge the coolant C supplied from the second pump 28 toward the communication portion 8. The coolant C discharged from the nozzle generates a liquid flow substantially along the side wall of the reflux tank 5, and the coolant C discharged from the nozzle 21 generates a liquid flow toward the vicinity of the center of the reflux tank 5.

  The third stirring nozzle body 26 is disposed so as to discharge the coolant C supplied from the second pump 28 toward the second coolant tank 7.

  The second stirring nozzle body 23 causes the coolant C supplied from the second pump 28 to be directed in a direction substantially perpendicular to the flow of the coolant C flowing from the communication portion 8, that is, upward in the drawing in FIG. Two parallel nozzles 24 and 25 for discharging are provided, and the coolant C discharged from the nozzle 25 generates a liquid flow substantially along the side wall of the second coolant tank 7 and is discharged from the nozzle 24. The coolant C generates a liquid flow toward the vicinity of the center of the second coolant tank 7.

  Further, a baffle plate 13 is provided in the second coolant tank 7 at a front position in the discharge direction of the coolant C in the second stirring nozzle body 23. As shown in FIG. 2, the baffle plate 13 is extended from the inner wall of the second coolant tank 7 toward the inside of the tank so as to block the flow of the coolant C, and as shown in FIG. A gap having an interval d through which the coolant C can flow is formed.

  The second coolant tank 7 is opposed to the tank inner wall surface along the tank inner wall surface (the inner wall surface on the lower side in FIG. 2) continuous from the communication section 8 at the connection portion of the communication section 8. As shown, a rectifying plate 14 is provided extending from the communication portion 8.

  According to the coolant supply device 1 of the present example having the above configuration, as described above, the coolant C in the second coolant tank 7 is pumped up by the fourth pump 30, the fifth pump 31, and the sixth pump 32, The pumped coolant C is supplied to the above-described parts, and the supplied coolant C is returned to the reflux tank 5. Thus, by such a circulation of the coolant C, a basic flow of the coolant C flowing from the reflux tank 5 through the communication path 8 into the second coolant tank 7 is formed.

  Specifically, the coolant C is recirculated from the machining area of the machine tool through the chip conveyor to the reflux tank 5, and the coolant C supplied from the first pump 27 to the circulation path of the main shaft appropriately passes through the flow path. Further, the coolant C supplied from the sixth pump 32 to the base portion of the machine tool is also appropriately returned through the flow path. Further, the coolant C supplied from the fifth pump 31 to the advanced clean tank 4 overflows and flows into the reflux tank 5. In the reflux tank 5, such a coolant C causes a liquid flow toward the communication portion 8, and the coolant C flows from the reflux tank 5 toward the second coolant tank 7 through the communication portion 8.

  Further, in the second coolant tank 7, the coolant C is pumped up by the fourth pump 30, the fifth pump 31, and the sixth pump 32, respectively. The pumping action and the liquid flow of the coolant C flowing from the communication portion 8 rotate. A flow is generated.

  In the coolant supply device 1, the coolant C supplied from the second pump 28 is discharged from the nozzles 21 and 22 of the first stirring nozzle body 20 and discharged from the nozzle 22 in the reflux tank 5. The coolant C generates a liquid flow substantially along the side wall of the reflux tank 5, and the coolant C discharged from the nozzle 21 generates a liquid flow near the center of the reflux tank 5. Thereby, the flow of the coolant C toward the communication portion 8 is assisted by the coolant C discharged from the slurs 21 and 22, and the coolant C in the reflux tank 5 is stirred. Further, since the arc-shaped rectifying plate 9 is provided at the corner portion of the reflux tank 5, the flow of the coolant C in the same portion can be made a smooth flow without stagnation.

  Thus, in this reflux tank 5, while assisting the flow of the coolant C in the tank, the coolant C is stirred, and a smooth flow without stagnation is formed. Even when foreign matter such as sludge is mixed, the foreign matter can be prevented from being precipitated and deposited.

  Moreover, in the communication part 8, since the coolant C is discharged toward the 2nd coolant tank 7 from the 3rd stirring nozzle body 26, the coolant C which flows in from the reflux tank 5 is discharged from the 3rd stirring nozzle body. The coolant C is assisted and accelerated, and the coolant C flows into the second coolant tank 7. Thereby, in the communication part 8, it is suppressed that a foreign material settles and accumulates.

  On the other hand, in the second coolant tank 7, the coolant C supplied from the second pump 28 is discharged from the nozzles 24 and 25 of the second stirring nozzle body 23, respectively, and the coolant C discharged from the nozzle 25 is the second coolant tank. 7 generates a liquid flow substantially along the side wall of the nozzle 7, and the coolant C discharged from the nozzle 24 generates a liquid flow toward the vicinity of the center of the second coolant tank 7. Thereby, the flow (swirl flow) of the coolant C in the second coolant tank 7 is assisted and stirred by the coolant C discharged from the nozzles 24 and 25. Further, since the arc-shaped rectifying plates 10, 11 and 12 are provided at the corners of the second coolant tank 7, respectively, the flow of the coolant C in the same part can be made smooth without any stagnation.

  Note that the flow velocity of the swirl flow formed in the second coolant tank 7 is the weakest at the position far from the second stirring nozzle body 23, that is, at the front position in the discharge direction. The flow rate is increased by the pumping action of the fourth pump 30, the fifth pump 31, and the sixth pump 32.

  In the coolant supply device 1 of the present example, the baffle plate 13 is provided at a portion where the flow rate of the coolant C is weakened, and therefore the flow rate of the coolant C can be accelerated by the action of the baffle plate 13. That is, the flow of the coolant C from the second stirring nozzle body 23 toward the front is blocked by the baffle plate 13, and the gap formed between the baffle plate 13 and the tank bottom surface 7a shown in FIG. It becomes a mode of passing. Then, the coolant flow path is narrowed by the baffle plate 13 in this manner, so that the flow rate of the coolant passing through the gap is increased.

  Thus, in the second coolant tank 7, the coolant discharged from the second stirring nozzle body 23 assists the coolant flow in the tank, whereby the coolant in the tank 7 is stirred, and the current plate 10 , 11 and 12, a smooth flow without stagnation is formed, and by these respective actions, foreign matter is prevented from being precipitated and deposited in the second coolant tank 7.

  Further, since the baffle plate 13 is provided at a position where the coolant flow velocity is weakened, the flow rate of the coolant C can be increased when passing through the gap between the baffle plate 13 and the tank bottom surface 7a. In this part, foreign matter is prevented from being precipitated and deposited.

  Further, in the second coolant tank 7 of this example, in the connection part of the communication part 8, the inside of the tank along the tank inner wall surface (the inner wall surface on the lower side in FIG. 2) continuous from the communication part 8. A rectifying plate 14 is provided extending from the communication portion 8 so as to face the wall surface.

  As described above, in the second coolant tank 7, the liquid flow is assisted by the coolant C discharged from the second stirring nozzle body 23, and a swirl flow swirling along the tank wall is formed. Therefore, at the connection portion between the communication portion 8 and the second coolant tank 7, the coolant flow flowing in from the communication portion 8 and the swirling coolant flow in the second coolant tank 7 collide, and the coolant C from the communication portion 8 flows. Since the inflow is hindered, foreign matters are likely to precipitate and accumulate in the communication portion 8.

  Thus, by providing the rectifying plate 14, the coolant flow flowing from the communication portion 8 and the swirling coolant flow in the second coolant bath 7 are connected at the connection portion between the communication portion 8 and the second coolant tank 7. Therefore, the coolant C can be smoothly merged, and the coolant C can be flown from the communication portion 8 in a satisfactory manner. Thereby, it can prevent that a foreign material settles and accumulates in the connection part of the communication part 8. FIG.

  As mentioned above, although the coolant supply apparatus which concerns on one Embodiment of this invention was demonstrated, the specific aspect which this invention can take is not limited to this at all.

  For example, in the above example, the first stirring nozzle body 20 is composed of the nozzles 21 and 22, and the second stirring nozzle body 23 is composed of the nozzles 24 and 25. However, the present invention is not limited to such a configuration. The stirring nozzle body 20 and the second stirring nozzle body 23 may be composed of one nozzle, or may be composed of three or more nozzles. The number of nozzles may be set to an appropriate number that can eliminate this, depending on the state of precipitation and accumulation of foreign matter in the reflux tank 5 and the second coolant tank 7. Further, the discharge direction of each nozzle may be set in an appropriate direction so as to eliminate the precipitation and accumulation of foreign matters in each tank.

  Further, the installation of the third stirring nozzle body 26 is optional, and it is not particularly necessary to provide this when the foreign substance does not precipitate or accumulate in the communication portion 8.

  Further, all of the first pump 27 to the sixth pump 32 are not necessary, and may be appropriately installed according to the purpose of supplying the coolant.

DESCRIPTION OF SYMBOLS 1 Coolant supply apparatus 2 Coolant tank 3 1st coolant tank 4 Advanced clean tank 5 Reflux tank 6 Partition plate 7 2nd coolant tank 8 Communication part 8
9, 10, 11, 12 Current plate 13 Baffle plate 14 Current plate 20 First stirring nozzle body 21, 22 Nozzle 23 Second stirring nozzle body 24, 25 Nozzle 26 Third stirring nozzle body 27 First pump 28 Second pump 29 3rd pump 30 4th pump 31 5th pump 32 6th pump

Claims (4)

The first and second coolant tanks having a substantially rectangular shape in plan view and arranged in parallel with a predetermined interval therebetween, and one end of the first and second coolant tanks are provided at one end. Including a communication part connected to the side wall of the first coolant tank, the other end connected to the side wall of the second coolant tank, and the first coolant tank and the second coolant tank communicating with each other. A coolant tank formed in a letter shape,
A supply pump that pumps up the coolant in the second coolant tank and supplies the coolant to a predetermined site;
The coolant supplied to the predetermined portion by the supply pump is returned to the first coolant tank, and the coolant in the first coolant tank flows through the communication portion and flows into the second coolant tank. In the coolant supply device,
At least one agitation pump for pumping up the coolant in the coolant tank;
A first agitation nozzle body disposed in the first coolant tank and discharging the coolant supplied from the agitation pump to assist the flow of the coolant toward the communication part;
A second agitating nozzle body disposed in the second coolant tank, which discharges the coolant supplied from the agitation pump and assists the flow of the coolant flowing in from the communication portion; A coolant supply device.   At least one of the first agitation nozzle body and the second agitation nozzle body has a plurality of discharge ports, and the discharge direction of at least one of the plurality of discharge ports is the other discharge port. The coolant supply device according to claim 1, wherein the coolant supply device is directed closer to the center in the tank than the discharge direction. The second coolant tank includes a baffle plate provided at a front position in the coolant discharge direction of the second stirring nozzle body,
The baffle plate is extended from the inner wall of the second coolant tank to the inner surface of the second coolant tank with an interval through which the coolant can flow so as to block the flow of the coolant. The coolant supply device according to claim 1 or 2, characterized in that The second coolant tank is provided with a current plate extending from the communication portion along the inner wall surface of the tank so as to face the inner wall surface of the tank, and adjusting a flow of the coolant flowing in from the communication portion. The coolant supply device according to any one of claims 1 to 3, wherein

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